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This is probably one of the easiest DIY things to do to make your shorts look amazing! I`ve done this to the front of my shorts (in the pocket) and its really easy and it looks great!
All you need to do is buy a pack of about 100 studs, just go and ebay and search for any type of studs (i used pyramid studs like on the picture, but you can use any studs you want). Make sure you buy 7mm to 10mm sized studs, because you wouldn`t want miniature of giant studs on your shorts, and make sure they have spiked ends. They are very cheap and have multiple uses, not just for shorts (eg. converses or shirts). You will also need tweezers.
After, take a stud and push it through your shorts. Then take your tweezers and use them to push the spiked ends of the studs down. Make sure you push it hard because they can scratch you when you wear your shorts if you don`t do it properly. Keep on doing that throughout the area of shorts you want. I would suggest a triangle on the back pocket like the picture, or you could fill up one front pocket with studs, or do a cross on the back pocket.